1991742152442 has 16 divisors (see below), whose sum is σ = 4552553491392. Its totient is φ = 569069186400.

The previous prime is 1991742152423. The next prime is 1991742152461. The reversal of 1991742152442 is 2442512471991.

It is an interprime number because it is at equal distance from previous prime (1991742152423) and next prime (1991742152461).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23711216059 + ... + 23711216142.

It is an arithmetic number, because the mean of its divisors is an integer number (284534593212).

Almost surely, 2^{1991742152442} is an apocalyptic number.

1991742152442 is an abundant number, since it is smaller than the sum of its proper divisors (2560811338950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1991742152442 is a wasteful number, since it uses less digits than its factorization.

1991742152442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47422432213.

The product of its digits is 1451520, while the sum is 51.

The spelling of 1991742152442 in words is "one trillion, nine hundred ninety-one billion, seven hundred forty-two million, one hundred fifty-two thousand, four hundred forty-two".